A major 9th chord is created by adding a 9th degree to any major 7th chord. For example, a Cmaj9 chord contains the notes C, E, G, B and D (1, 3, 5, 7 and 9). Here are some common open maj9 chord shapes.
Cmaj9
Ebmaj9
Emaj9
Fmaj9
Gmaj9
Dbmaj9
Dmaj9
F#maj9
Abmaj9
Amaj9
Bbmaj9
Bmaj9